/Engine/Source/Runtime/Foliage/Public/InstancedFoliageActor.h
Performs a reverse lookup from a source object to all the foliage types that are currently using that object (includes assets and blueprint classes)
void GetAllFoliageTypesForSource ( const [UObject](API\Runtime\CoreUObject\UObject\UObject) * InSource, [TArray](API\Runtime\Core\Containers\TArray)< const [UFoliageType](API\Runtime\Foliage\UFoliageType) * > & OutFoliageTypes )